Drop-hammer.



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Specicaton of Letters Patent.

Patented May 22, 1906.

Application filed December 3,1904. Serial No. 235,295.

To a/Z whom t may concern:

Be it known that I, EDWARD W. MERRILL, Jr., a citizen of the United States, and a resident of the borough of Brooklyn, in the city and State of New York, have invented a new and useful Improvement in Drop-Hammers, of which the following is a specification.

The object of this present invention is to provide certain means in motive-fluid-controlled drop-hammers whereby manually-operated means may be provided for permitting the motive fluid to release the lifter for permitting the hammer to drop at pleasure.

In the accompanying drawings, Figure 1 represents in side elevation so much of a motive-fluid-operated drop-hammer as will give a clear understanding of my invention. Fig. 2 is a transverse section in the plane of the line A A of Fig. 1. Fig. 3 is a partial transverse section taken in the'plane of the line B B of Fig. 1. Fig. 4 is a detail section through one of the brake-band-setting springs, and Fig. 5 is an enlarged longitudinal central view through' the controlling-valve.

The hammer-lifting shaft is denoted by 1, its lifting-arms by 2 2, the hammer by 3, the lift-strap by 4, and the loose pulley on the shaft for the strap by 5. This rotary shaft extends through the motive-fluid cylinder 6, within the chamber of which is a winged piston 7, iixed to the shaft, and a stationary abutment 8, fixed to the cylinder, as is usual. The motive-fluid inlet-port for the cylinder 6 is denoted by 9 and the outlet-port, which leads to the external air, by 10. The main `motive-iiuid-feed pipe, which is denoted by 11, leads to a master-valve box 12, from which a port 14 leads to the interior of the valve-box 12*. A slide-valve 13 in the valvebox 12* is arranged to be moved to bring the port 14 into and out of communication with the port 9 and the port 9 into and out of communication with the outlet-port 15, which in .this instance comprises the open end of the valve-box 12*.

A brake-pulley 16 is iixed to the shaft 1. A brake-band 17 has one end fixed to a permanent support, which in the present instance is the motive-fluid brake-releasing cylinder 18. The other end of the band 17 is provided with a cross-bar 19, to which are attached heavy springs 20, located in suitable casings 21, which springs tend to normally set the brake. In the present instance these springs 2O are interposed between the tops of the casings 2l and heads 22, carried by screw-bolts 23, mounted in rods 24, de-

pending from the cross-bar 19. A liftingplunger extends upwardly through the top of the cylinder 18 in position to engage the under side of the cross-bar 19. This plunger 25 is provided with a piston 26 within the cylinder 18. These parts are so arranged that when the piston is lifted by the motive iuid the plunger 25 will lift the bar 19 against the tension of the springs 20, and thus release 'the brake.

The casing of the controlling-valve is denoted by 27. This casing is provided with three series of ports 28, 29, and 30.' The series of ports 28 are connected to the main motive-iluid-supply pipe 11 through a pipe 31. The series of ports 29 are connected to the interior of the cylinder 18 below the piston 26 through a pipe 32. The series of ports 30 are connected to the exhaust-port 33 of the cylinder 6 through a pipe 34.

A slide-valve is located in the casing 27, which valve has an annular port 36, which is arranged to open communication between the pipes 32 and 34 and close the ports 28 of the pipe 31 when at the limit of its movement in one direction and to close the ports 30 and open communication between the pipe 31 and the pipe 32 when at the limit of its movement in the other direction. This valve 35 is provided with a stem 37, to which may be attached any suitable connection-such, for instance, as a chain 38 for use in moving the valve in one direction. A spring 39, carried by the valve-casing 27, engages a collar 40 on the stem 37, tending to hold the valve 35 at the limit of its movement in the opposite direction.

The operation of the invention is as follows: The controlling-valve 35 is supposed to be in its normal raised position, opening communication between the pipes 32 and 34. The valve 13 is moved into position to open communication from the main motive-fiuid-supply pipe 11 to the inlet-port 9 of the cylinder 6, the outlet-port 10 being open to the external air. This will admit the motive Huid into the piston-chamber between the piston 7 and. abutment 8 and also admit motive fluid through the port 33, pipe 34, and pipe 32. to the under side of the piston 26 of the brakecontrolling means. The plunger 25 will be raised, thus releasing the brake and permitting the shaft 1 to be partially rotated by its piston 7. This will cause the lifter-arms 2 2 to raise the strap 4, and thereby the hammer IOO IIO

' port 9 and port 15 to the atmosphere. This will permit the hammer 3 to 'exert its weight in a direction tending to reverse the shaft 1. However, the moment the pressure is removed from the back of the brake-cylinder piston 26 the piston, and thereby the plunger 25, will drop, thus permitting the springs 20 to set the brake and hold the hammer suspended.

When itis desired to release the hammer, the controlling-valve 35 is manually moved to the limit of its downward movement, thus connecting the ports 28 and 29 and cutting off port 30 of pipe 34, thereby opening communication from the main motive-fluidsup ply pipe 11 to the under side of the piston 26 of the cylinder 18 through the pipes 31 and 32. This will cause the plunger 25 to release the brake, as hereinbefore described, and thereby permit the hammer 3 to drop and the shaft l and winged piston 7 to rotate in the reverse direction back to their original position.

What I claim as my invention is 1. In a motive-fluid-operated drop-hammer, a part-rotating shaft, a hammer arranged to be lifted thereby, a brake for the shaft, means for normally setting the brake, duid-controlled means for simultaneously releasing the brake and rotating the shaft for raising the hammer, means arranged to permit the brake to act when the hammer reaches a predetermined point in its upward movement and additional means for releasing the brake and thereby the shaft to permit the hammer to drop.

2. In a motive-fluid-operated-drophammer, a part-rotating shaft, a hammer arranged to be lifted thereby, its operating-pis ton, a brake for the shaft, means for normally setting the brake, a brake-releasing piston, means for simultaneously supplyingl the motive fluid to the brake-piston and the hammer-operating piston for releasing the brake androtating the shaft for raising the hammer, said means being arranged to cut off the power from the brake-piston and hammeroperating piston when the hammer reaches a predetermined point in its upward movement to permit the brake-setting means to act, and manually-controlled means for feeding the motive fluid to the brake-piston for releasing the brake and thereby the shaft to permit the hammer to drop.

3. In a motive-iiuid-operated drop-ham mer, a part-rotating shaft, a 'hammer arranged to be lifted thereby, a motive-fluid cylinder, a piston carried by the shaft within the cylinder, a brake for the shaft, means for normally setting the brake, a second cylinder, a brake-releasing piston therein, a valve for the part-rotatingshaft cylinder and piston arranged to simultaneously supply motive iiuid to the shaft and brakecylinders to release the brake and rotate the shaft for rais' ing the hammer, to cut off the motive iiuid from the cylinders when the hammer reaches a predetermined point to permit the setting of the brake and a controlling-valve arranged to feed the motive fluid to the brake-cylinder to release the brake and thereby the shaft to permit the hammer to drop. f

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, ber, 1904. EDWARD W. MERRILL, JR.

Witnesses:

FREDK. HAYNEs, HENRY THIEME.

this 1st day of Decem- 

